John XIII of Constantinople
John XIII of Constantinople (Greek: Ἰωάννης; died after 1320) was the Ecumenical Patriarch of Constantinople from 1315 to 1319. Prior to becoming the patriarch, he had served in the laity and his name was Glykys Melodos; he was sometimes referred to as John Glykys.
Source: Wikipedia — John XIII of Constantinople (CC BY-SA 4.0)